Have you tried: - deactivating all plugins to see if this resolves the problem? If this works, re-activate the plugins one by one until you find the problematic plugin(s). - switching to the Twenty Ten theme to rule out any theme-specific problems? - resetting the plugins folder by FTP or phpMyAdmin? Sometimes, an apparently inactive plugin can still cause problems. - re-uploading the wp-admin and wp-includes folders from a fresh download of WordPress? - increasing the memory available to PHP? wordpress.org/support/topic/253495#post-1017842
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kallekillenJan 16 '13 at 10:23